Shaking-screen.



No. 719,305. PATENTED FEB. s, 1903.

G. S. INGLE.

SHAKING SCREEN. APPLICATION FILED JULY 3. 1901.

N0 MODEL.

THE Ncmus warns on. Puomuruc WASHINGTON. o, c.

UNITED STATES PATENT OFFICE.

GEORGE S. INGLE, OF INDIANAPOLIS, INDIANA.

SHAKlNG-SCREEN.

SPECIFICATION forming part of Letters Patent No. 719,805, dated February3, 1903. Application filed July 3, 1901. Serial No. 67,030- (No model.)

To all whom it may concern.-

Be it known that I, GEORGE S. IN GLE, a citizen of the United States,residing at Indianapolis, in. the county of Marion and State of 5Indiana,have invented a new and useful Shak ing-Screen, of which thefollowing is a specification.

Screens employed in separating coal and like material into its severalgrades and re- 0 moving the culm therefrom have usually been supportedfrom overhead,-one being located beneath the other and reciprocatedsimultaneously in opposite directions. As a result the buildingcontaining them has to be built comparatively high, and because of thesupport being at such a height the structure must be sufiiciently stableto withstand the rack and vibration to which it is subjected. Anotherfeature to be noted in the swinging support is that when the screens areswung outwardly or away from each other they are raised and power enoughmust be supplied to accomplish this simultaneous lifting of all. On theother hand, they will gravitate toward each other on the backward swing,thus relieving the driving power of its entire load. The consequence isthat the load varies from its maximum to practically zero, and thedriving mechanism is thus continually being subjected to extremelyundesirable shocks.

The present invention relates to this class of apparatus; and itsprincipal objects are to overcome the above objections, first, byproviding means formounting the screens so that the support will becomparatively low, decreasing the cost of the building both in size andconstruction, and, secondly, by so mounting the screens in pairs thatthey will counteract each others movement, with a ing power necessaryand the practical removal of the shocks thereto above described, saidscreens being constructed and arranged to support substantiallyproportionate loads, so that they will always practicallycounterbalance.

Another object is to provide a novel construction and combination inwhich one of the counterbalancing-screens upon its movement in onedirection will overcome the inertia of the other screen, and thus to agreat degree eliminate the sudden jar and shock consequent decrease inthe amount of driv otherwise imparted to the driving power in startingloaded screens from a state of rest.

In the accompanying drawings there is shown an embodimentof the presentinvention which is at present considered preferable, and theconstruction and operation thereof is fully described in the followingspecification. The invention, however, is not to be limited to the exactconstruction shown, but is open to such changes and modification as arewithin the scope of the claims.

In the drawings, Figure 1 is a side elevation of the improved screensand the supports therefor. Fig. 2 is a top plan view of the same, andFig. 3 is a vertical transverse section clearly illustrating themounting of the axles.

Similar numerals of reference, designate corresponding parts in thedifferent figures of the drawings.

In the practical embodiment of the invention, as shown in theaccompanying drawings, a suitable supporting-frame is provided,comprising spaced standards lO, connected a suitable distance above thefloor by stringers 11, which are strengthened by corner-braces 12, thusleaving open passage-ways beneath for cars or suitable receptacles, asindicated at 13. Supported upon the stringers 11 are vertically-disposedspaced studs 14, between certain of which are secured transversecarrierblocks 15, having suitable braces 1 6. On these carrier-blocksare located tracks 17, that may be of any desired construction, but, asshown, comprise short sections of Thom or railroadrails. These trackspreferably are inclined their entire lengths, and each has an upstandingend, as 18, that is disposed at a greater inclination than the mainportion. It will therefore be seen that these tracks each comprise aprimary and a secondary portion that are connected and located inobtuse-angular relation, the primary portion being disposed at a lessinclination than the secondary portion, and that each of the inclinedportions of the several tracks are situated in parallel relation to thecorresponding portions of the other tracks, so that the screens willmaintain their parallel relation.

A pair of screens 19 are shown, one being arranged above the other, andsaid screens may be of any suitable construction, though,

as illustrated, comprising perforated steel plates 20, bolted or rivetedto angle-steel frames 21. The perforations are graded in a manner wellunderstood by those skilled in this art. It will be observed that thelower screen is considerably longer than the upper one and that saidupper screen overlaps the lower one. This insures a counterbalance whenthe screens are loaded. The upper screen of course receives all the coaland is heavily loaded, while only part of said load passes through tothe lower screen and a part 1 of that which does reach said lower screenpasses on through it. In order, therefore, to make up for the excess ofweight on the upper screen, the lower one is made longer, so that thecoal must remain on it for a longer period,'and in this manner thenecessary weight is obtained. Secured transversely across the undersides of the screens are axles 22 by means of clips 28, said axlesprojecting beyond the sides of the screens forming spindles upon whichare rotatably mounted supporting-wheels 24, said wheels bearing upon thetracks 17. By referring to Fig. 1 it will be seen that the screens areinclined in one direction while the tracks are inclined in the oppositedirection.

For the purpose of operating the screens a driving-shaft 25 is providedcontiguous to one end thereof, said shaft having a pulley 26, over whichruns a belt 27, connected to any suitable driving power. The shaft 25 isfurthermore provided with eccentrics 28, a pair of which are located onopposite sides of the pulley 26, the eccentrics of each pair beingarranged on opposite sides of the shaft. Pitmen 29 are pivotallyconnected to the opposite sides of the screens by means of pins 30 andare secured to the eccentrics by means of straps 31, the pitmen of onescreen being secured to the eccentrics located on one side of the shaft,while those of the other are connected to the opposite ones.

In operation the driving-shaft is rotated through the medium of the belt27, and because of the opposite arrangement of the cocentrics thescreens will be simultaneously reciprocated in opposite directions. Itwill thus be seen that as one screen is moved up the inclined tracks theother is moved down, and because of this movement they practicallycounterbalance each other, so that the load upon the engine or drivingmechanism remains constant. Further than this, however, because of thetracks being inclined in a direction opposite to the inclination of thescreen when said screen is moved to its highest position and starts onthe reverse movement it will drop slightly, and thus tend to move fromunder the coal or other material upon the same. On the other hand,during its upward movement it will be carried with greater force againstthe coal, which will move downward with it. A still further andimportant result is obtained by the specific structure of the tracks.This may probably be best explained as follows: During eachreciprocation the screens must come to a full stop before their motionis reversed. There is thus considerable inertia to be overcome eventhough the coal does not reach a state of rest. At the ends of theirmovements the rollers of one of the screens will be resting upon theupper sharper inclines of their tracks, while those of the other screenwill bear upon the lower and lesser inclined portions. As the reversemovement takes place the weighted and raised screen will immediatelydrop down said steep inclines, and its momentum will be great enough toovercome the'inertia of the lower screen, which will thereupon start upthe inclines of less degree. As a result no heavy jars, shocks, orstrains will be imparted to the driving power. The material will bemoved at a comparatively rapid rate over the screen, thus giving thesame a greater capacity. By this means the objects mentioned in thepreliminary portion of the specification are accomplished, the entiremechanism is extremely simple, and the elements are few.

From the foregoing it is thought that the construction, operation, andmany advantages of the herein-described invention will be apparent tothose skilled in the art Without further description, and it will beunderstood that various changes in the size, shape, proportion, andminor details of construction may be resorted to without departing fromthe spirit or sacrificing any of the advantages of the invention. Forinstance, the wheels 24 are shown as smooth and running on smoothtracks; but it will be obvious that they may be toothed and engaged withcorresponding teeth provided on the upper faces of the tracks.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a separator of the class described, the combination with a pair ofscreens, of tracks arranged contiguous to each screen, said tracks eachcomprising sections, one section being disposed at an inclination to theother, supporting devices for the screens mounted upon the tracks, andmeans for simultaneously reciprocating the screens in oppositedirections, the supporting devices of one screen being arranged to moveover the inclined sections of their respective tracks when thesupporting devices of the other screen are upon the oppositetrack-sections.

2. In a separator of the class described, the combination withlongitudinallymovable screens arranged one below the other,of tracksdisposed at an inclination to the screen and having their upper endsarranged at a sharper inclination than their main portions, supportingdevices for the screens movably mounted upon the tracks, and means forreciprocating the screens in opposite directions, the supporting devicesbeing so arranged that those of one screen will be moving upon thesharper in parallel relation to the corresponding portions of the othertracks, wheels journaled upon the screens and movably mounted upon thetracks, and means for simultaneously reciprocating the screens inopposite directions.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in 20 the presence of two witnesses.

GEORGE S. INGLE.

Witnesses:

W. B. SULLIVAN, J. S. COOKERLY.

